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Transcoder

a transcoder and encoder technology, applied in the field of transcoders, can solve the problems of affecting the image quality, so as to achieve the effect of maintaining the image quality

Inactive Publication Date: 2014-07-15
MEGACHIPS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]It is thereby possible to adaptively make the amount of generated codes appropriate.
[0016]Therefore, it is an object of the present invention to appropriately control the amount of generated codes of the output stream toward a target bit rate while keeping the balance between the purpose of making the bit rate constant and the purpose of maintaining the image quality.

Problems solved by technology

Therefore, the degree of difficulty in image compression significantly varies depending on the scene.
Such a code amount control disadvantageously causes degradation of image quality.
Since there is a possibility, however, that such a control locally increases or decreases the bit rate, there arise some cases where it is not compatible with the band limiting of the channel.

Method used

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Examples

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Embodiment Construction

[0022]{1. Overall Structure of Transcoder}

[0023]Hereinafter, the preferred embodiment of the present invention will be discussed, referring to the drawings. FIG. 1 is a block diagram showing a transcoder 1 in accordance with the preferred embodiment. The transcoder 1 comprises a decoder 2 and an encoder 3. The transcoder 1 further comprises a buffer 4, an average value calculation part 5, a buffer 6 and an average value calculation part 7.

[0024]The decoder 2 inputs a first stream. The first stream is a stream of coded image. The decoder 2 decodes the first stream and outputs uncompressed image data to the encoder 3. The encoder 3 recodes the uncompressed image data which is decoded by the decoder 2 and outputs a second stream.

[0025]The transcoder 1 converts a coding system of stream, and for example, inputs a first stream coded in MPEG2 and outputs a second stream coded in H.264. The present invention is devised in order to optimally control the rate of the second stream to be outpu...

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Abstract

In a transcoder, a decoder decodes a stream and an encoder encodes the stream again. The encoder calculates the quantization step value by using an average period bit rate (ASn(M)) of a first stream or an average period bit rate (ACn(M)) of a second stream. Buffers store bit rates (Sn, Cn) of the first and second streams for M periods, respectively. The encoder uses the average period bit rate (ASn(M)) of the first stream or then average period bit rate (ACn(M)) of the second stream in any one of the periods M1, M2 and M3 among M periods.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a transcoder for converting an input stream by decoding into a different output stream, and more particularly to a technique to appropriately control the amount of generated codes of the output stream toward a target bit rate.[0003]2. Description of the Background Art[0004]Images to be delivered on digital broadcasts, those to be stored in media such as DVDs and hard disks, and the like are compressed in accordance with various coding systems. The object for such compressions is to avoid constraint on a transmission band, increase the transmission speed, decrease the memory size, or the like.[0005]There are various standards for image coding system, such as MPEG2 and H.264. And there is a case where the coding system is converted for the purpose of reducing the amount of codes in a coded image that is inputted, or the like. A transcoder once decodes the inputted coded image. Then, the tr...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04N7/12H04N19/00H04N19/126H04N19/134H04N19/146H04N19/172H04N19/177H04N19/196H04N19/40
CPCH04N19/61H04N19/00096H04N19/0006H04N19/40H04N19/00472H04N19/00187H04N19/162H04N19/126H04N19/115H04N19/0023H04N19/15H04N19/00781
Inventor HASEGAWA, HIROMUSAITO, MAKOTO
Owner MEGACHIPS